Hello,
I imagine this may have a trivial explanation, or perhaps indicate some quirk
on my machine, but it looks as though some desired functionality isn’t
available on my machine with version 1.4. I wanted to share this in case it
indicates some wider issue of interest, and helps me learn a little about how
cryptography works under the hood.
Windows 7, 64-bit, Python 3.5.1, and I believe OpenSSL 1.0.2. I use paramiko
for SFTP, and when updating paramiko (on a whim) to 2.0.2 with Anaconda, it had
me update cryptography as well, to version 1.4, or maybe it was 1.3 at first —
either one experiences the issue. When attempting an SSH connect, I get a
traceback ending with this:
File
"C:\Users\...\AppData\Local\Continuum\Anaconda3\lib\site-packages\cryptography\hazmat\bindings\openssl\binding.py",
line 73, in wrapper
if lib.Cryptography_STATIC_CALLBACKS:
AttributeError: cffi library '_openssl' has no function, constant or global
variable named 'Cryptography_STATIC_CALLBACKS'
When I manually carry out some of the imports in the source...
from cryptography.hazmat.bindings._openssl import ffi, lib
...and then look at what auto-complete shows for lib, I don’t see
Cryptography_STATIC_CALLBACKS, which is consistent with the AttributeError. I
don’t yet understand where to look for the source underneath the bootstrapped
_openssl.*.pyd file.
The SSH connection and all subsequent functionality work fine with the latest
versions of paramiko and cffi as long as I revert cryptography to 1.0.2.
-Robin Fishbein
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